Execution failed for task ':app:dexDebug' Android Studio

Question

The application was able to execute before updating my android studio,this is the error I am getting:

Error:Execution failed for task \':app:dexDebug\'.
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Answer 1

I got this error today out of nothing, after that i tried to update every single thing available, tried to change my gradle build as suggested here but none of it worked.

After hours of dispair and AS updates, a simple "clean project" and "rebuild project" worked for me.